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docs: mention POSIX 2008

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* doc/coreutils.texi (Standards conformance): Give value of
_POSIX2_VERSION matching the _POSIX_C_SOURCE of POSIX 2008.
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Eric Blake
2011-04-01 15:37:35 -06:00
parent 03583f8d64
commit 8d0b79afa5
1 changed files with 4 additions and 3 deletions
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@@ -1455,10 +1455,11 @@ The @sc{gnu} utilities normally conform to the version of @acronym{POSIX}
that is standard for your system. To cause them to conform to a
different version of @acronym{POSIX}, define the @env{_POSIX2_VERSION}
environment variable to a value of the form @var{yyyymm} specifying
the year and month the standard was adopted. Two values are currently
the year and month the standard was adopted. Three values are currently
supported for @env{_POSIX2_VERSION}: @samp{199209} stands for
@acronym{POSIX} 1003.2-1992, and @samp{200112} stands for @acronym{POSIX}
1003.1-2001. For example, if you have a newer system but are running software
@acronym{POSIX} 1003.2-1992, @samp{200112} stands for @acronym{POSIX}
1003.1-2001, and @samp{200809} stands for @acronym{POSIX} 1003.1-2008.
For example, if you have a newer system but are running software
that assumes an older version of @acronym{POSIX} and uses @samp{sort +1}
or @samp{tail +10}, you can work around any compatibility problems by setting
@samp{_POSIX2_VERSION=199209} in your environment.